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制备表面含-OH-、NH2-、CHO的三种HMS载体,研究这些载体表面功能团对Salen-Mn配合物的吸附固载作用,用FT-IR,TG-DSC表征配合物与载体表面基团的相互作用,并用配位滴定法测定了Mn的负载量。以E-二苯基乙烯环氧化反应考察其催化氧化性能和对环氧化物选择性的影响。结果表明,含表面-OH的HMS固载Salen-Mn的效果较差,而含表面-NH2,-CHO的HMS对Salen-Mn有较好的固载作用;对固载Salen-Mn的载体孔口改性可进一步提高环氧化物的选择性并减少Mn的流失。
Three kinds of HMS carriers containing -OH-, NH2- and CHO on the surface were prepared. The adsorption and immobilization of the functional groups on these carriers on Salen-Mn complexes were investigated. The complexes were characterized by FT-IR and TG-DSC. Group interactions and the amount of Mn loading was determined by the coordination titration method. E-diphenylethylene epoxidation was used to investigate the catalytic oxidation and epoxide selectivity. The results show that HMS with surface-OH immobilized Salen-Mn is less effective, while HMS with surface -NH2 and -CHO has a better immobilization effect on Salen-Mn. Mouth modification can further enhance the selectivity of epoxides and reduce the loss of Mn.